The BGS Lexicon of Named Rock Units — Result Details

Mosedale Andesite Formation [Obsolete Name: Part Of BFA]

Computer Code: MOA Preferred Map Code: notEntered
Status Code: Index Level
Age range: Caradoc Series (O4) — Caradoc Series (O4)
Lithological Description: Thick flows of porphyritic andesite and dacite, some with garnet phenocrysts, separated by thin interbeds of volcaniclastic sediments.
Definition of Lower Boundary: Not defined.
Definition of Upper Boundary: Defined by base of Dunnerdale Formation (bedded volcaniclastic sediments).
Thickness: Not defined.
Geographical Limits: Not defined.
Parent Unit: Borrowdale Volcanic Group (BVG)
Previous Name(s): Mosedale Andesites (-3556)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  In the vicinity of Mosedale, Duddon Valley, Cumbria. 
Type Area  In the vicinity of Wrynose Bottom, Duddon Valley, Cumbria. 
Reference(s):
Hartley, J J. 1932. The Volcanic and other Igneous rocks of Great and Little Langdale, Westmorland: with notes on the Tectonics of the district. Proceedings of the Geologists' Association, Vol.43, p.32-69. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E038